Looks like a lot of fun! Is this in Andersmatt?
Good high level skiing.
: You seemed to get more comfortable toward the end of the tape while the pitch remained constant. In my experience, the first few turns at the steepness are of course the most difficult. We all need to get a feel for the snow and the pitch.
Try to look a little further down the hill. You seemed to be focused on your skis and that may have contributed to your breaking at the waist.
Your skis will come around in more of an arc if your movements are directed down the hill. Project you CM down the pitch by extending your legs at the finitiation. Your pole swing should be down the fall line.
In the tighter spaces and early turns, your right pole swing was toward the tips which delays edge release and elongates the turn. Your left pole touch was next to your boots leaving you fairly compact.
If you have the good fortune to get another shot at this type of terrain you might want to experiment with retraction-extension turns. You are a very strong skier and I think you will enjoy that movement pattern.